Nail-expansion anchor



A O I I 1927 c. H. KLEIN NAIL EXPANSION ANCHOR Filed Aug. 25. 1923 IN VEN TOR (I. E flZe/m/ K A 'ITORNIE Y tented Aug. 2, 1927.

' UNITED STATES PATENT OFFICE.

HABLES H. KLEIN, OI JERSEY CITY, NEW- JERSEY, ASSIGNOB TO AMEBIIGAN TELE- PHONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW "YORK.

nan-mansion meson.

Application filed August 23, 1923. Serial Io. 659,023.

Bans for securing cable clamps and other :vices to masonry. I

The invention is embodied in a hollow 'linder, made preferably from sheet metal. he anchor is placed in a hole drilled in the asonry, and a nail is driveninto the cylinar, thus firmly securing the clamp or other :vice to the masonry. In the accompanying drawing, Fig. 1 LOWS in side elevation the nail which is riven into the anchor cylinder; Figs. 2 id 3 show 'in'crosS-section two desirable rrms of anchor constructed according to pplicants invention; and Fi 4 and 5 now top plan views corresponding to Figs. 2 1d 3 respectively. With reference to the details of Figsfl ad 4 of the drawing, 1 designates the wall E the cylinder, which wall is parted by the mgitudinal slot 2, this slot extend over 1e entire length of the cylinder wal and ermitting extra expansion and adjustment variations in the diameter of the drilled ole. The top 3 is flared out to form a colnm for the purpose of holding the clamp or then device to the wall. Circular corrugaions 4, 5 and 6', which may be ressed in the heet metal around the circum erenee of the ylinder, reduce the diameter of the center role at the low points of, the corrugations. Lhe outwardly projecting ridges formed by he corrugations are rounded. Due to the )rovision of rounded points of contact-be ween the cylinder and the wall of the hole.

ing power.

'closes two desirable forms of apphcants An expansion anchor consisting of a hol low cylinder parted by a longitudinal slot, the top of said cylinder being flared and the device will not i tend to cut into the masonry at the first slight e ansion of the shield, which cutting won d nevent 40 longitudinal movement in the hole, t is. longitudinal movement being desirable in order to insure a tight fastening on the final blow, of the hammer. When the nail is driven into the anchor and forced through the points where the corrugations have reduced the inside diameter,;it causes expansion of the anchor, producing pressure on the wall of the hole suflicient to give the desired hold- 50 Fig. 3 shows an anchor having differently formed corrugations but otherwise corre sponding to the form of Fig. 2.

It is understood that the drawing-dis- 5 anchor merely for purposes of illustration, and does not limit the $00 of the inven-. tilgn, which is determined y. the appended c 1m.

What is claimed is: m

the lower portion of said cylinder carrying; a plurality of circular corrugations, said corrugations reducing the diameter of the center hole at-the low points of the corrugations, and the outwardly projecting ridges formed by said corrugations being rounded.

' In testimony whereof, I have si ed my name to this specification this 22n 7 day of August, .1928.

CHARLES H. 

